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37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; RUN: opt -basic-aa -hexagon-loop-idiom -S -mtriple hexagon-unknown-elf < %s \
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; RUN: | FileCheck %s
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define void @PR14241(i32* %s, i64 %size) #0 {
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; Ensure that we don't form a memcpy for strided loops. Briefly, when we taught
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; LoopIdiom about memmove and strided loops, this got miscompiled into a memcpy
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; instead of a memmove. If we get the memmove transform back, this will catch
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; regressions.
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;
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; CHECK-LABEL: @PR14241(
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entry:
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%end.idx = add i64 %size, -1
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%end.ptr = getelementptr inbounds i32, i32* %s, i64 %end.idx
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br label %while.body
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; CHECK-NOT: memcpy
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; CHECK: memmove
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while.body:
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%phi.ptr = phi i32* [ %s, %entry ], [ %next.ptr, %while.body ]
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%src.ptr = getelementptr inbounds i32, i32* %phi.ptr, i64 1
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%val = load i32, i32* %src.ptr, align 4
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; CHECK: load
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%dst.ptr = getelementptr inbounds i32, i32* %phi.ptr, i64 0
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store i32 %val, i32* %dst.ptr, align 4
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; CHECK: store
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%next.ptr = getelementptr inbounds i32, i32* %phi.ptr, i64 1
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%cmp = icmp eq i32* %next.ptr, %end.ptr
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br i1 %cmp, label %exit, label %while.body
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exit:
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ret void
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; CHECK: ret void
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}
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attributes #0 = { nounwind }
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